smtp + email confirmation (#285)

* add smtp configuration

* add email confirm + reset templates

* add email sender to testrig

* flesh out the email sender interface

* go fmt

* golint

* update from field with more clarity

* tidy up the email formatting

* fix tests

* add email sender to processor

* tidy client api processing a bit

* further tidying in fromClientAPI

* pin new account to user

* send msg to processor on new account creation

* generate confirm email uri

* remove emailer from account processor again

* add processCreateAccountFromClientAPI

* move emailer accountprocessor => userprocessor

* add email sender to user processor

* SendConfirmEmail function

* add noop email sender

* use noop email sender in tests

* only assemble message if callback is not nil

* use noop email sender if no smtp host is defined

* minify email html before sending

* fix wrong email address

* email confirm test

* fmt

* serve web hndler

* add email confirm handler

* init test log properly on testrig

* log emails that *would* have been sent

* go fmt ./...

* unexport confirm email handler

* updatedAt

* test confirm email function

* don't allow tokens older than 7 days

* change error message a bit

* add basic smtp docs

* add a few more snippets

* typo

* add email sender to outbox tests

* don't use dutch wikipedia link

* don't minify email html

2 files changed, 66 insertions, 0 deletions

diff --git a/internal/web/base.go b/internal/web/base.go
index 0eda1185a..5d19a3f70 100644
--- a/internal/web/base.go
+++ b/internal/web/base.go
@@ -30,6 +30,12 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/processing"
 	"github.com/superseriousbusiness/gotosocial/internal/router"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+const (
+	confirmEmailPath = "/" + util.ConfirmEmailPath
+	tokenParam       = "token"
 )
 
 // Module implements the api.ClientModule interface for web pages.
@@ -100,6 +106,9 @@ func (m *Module) Route(s router.Router) error {
 	// serve statuses
 	s.AttachHandler(http.MethodGet, "/:user/statuses/:id", m.threadTemplateHandler)
 
+	// serve email confirmation page at /confirm_email?token=whatever
+	s.AttachHandler(http.MethodGet, confirmEmailPath, m.confirmEmailGETHandler)
+
 	// 404 handler
 	s.AttachNoRouteHandler(m.NotFoundHandler)
 
diff --git a/internal/web/confirmemail.go b/internal/web/confirmemail.go
new file mode 100644
index 000000000..97ed597d3
--- /dev/null
+++ b/internal/web/confirmemail.go
@@ -0,0 +1,57 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package web
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+)
+
+func (m *Module) confirmEmailGETHandler(c *gin.Context) {
+	// if there's no token in the query, just serve the 404 web handler
+	token := c.Query(tokenParam)
+	if token == "" {
+		m.NotFoundHandler(c)
+		return
+	}
+
+	ctx := c.Request.Context()
+
+	user, errWithCode := m.processor.UserConfirmEmail(ctx, token)
+	if errWithCode != nil {
+		logrus.Debugf("error confirming email: %s", errWithCode.Error())
+		// if something goes wrong, just log it and direct to the 404 handler to not give anything away
+		m.NotFoundHandler(c)
+		return
+	}
+
+	instance, err := m.processor.InstanceGet(ctx, m.config.Host)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.HTML(http.StatusOK, "confirmed.tmpl", gin.H{
+		"instance": instance,
+		"email":    user.Email,
+		"username": user.Account.Username,
+	})
+}